2,3-Dichloro-5,6-dicyanobenzoquinone (DDQ) is a bright yellow solid with a melting point of 213~215 °C, soluble in ethyl acetate and tetrahydrofuran, and has moderate solubility in Chemicalbook dichloromethane, benzene, dioxane and acetic acid. It is insoluble in water, but decomposes in the presence of water to release hydrocyanic acid, so it needs to be stored in a dry state.